CN112034604A - Telecentric lens suitable for industrial detection - Google Patents
Telecentric lens suitable for industrial detection Download PDFInfo
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- CN112034604A CN112034604A CN202010936820.7A CN202010936820A CN112034604A CN 112034604 A CN112034604 A CN 112034604A CN 202010936820 A CN202010936820 A CN 202010936820A CN 112034604 A CN112034604 A CN 112034604A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
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- Optics & Photonics (AREA)
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Abstract
The invention discloses a telecentric lens suitable for industrial detection, which comprises a conical lens barrel, a lens support ring arranged in an inner circular hole at the top end of the lens barrel, and a focusing ring sleeved outside the lens support ring, wherein a first spherical lens, a second spherical lens, a third spherical lens and a fourth planar lens are sequentially fixed in the lens support ring from top to bottom along an optical axis from an image object plane to an object plane, and a fifth spherical lens, a sixth spherical lens and a seventh spherical lens are sequentially fixed in the lens barrel from top to bottom along the optical axis from the image object plane to the object plane. Compared with the prior art, the telecentric lens suitable for industrial detection can realize an object space telecentric light path, overcomes the measurement error caused by the change of the object distance, has extremely low aberration and higher imaging precision, is suitable for industrial detection, and has simple structure and low cost.
Description
Technical Field
The invention relates to the field of optical lenses, in particular to a telecentric lens suitable for industrial detection.
Background
The telecentric lens is designed mainly for correcting the parallax of the traditional industrial lens, and can ensure that the magnification of the obtained image is not changed within a certain object distance range, which is very important to the condition that the measured object is not on the same object plane. Telecentric lenses have been favored for machine vision applications where lens distortion is highly demanding due to their unique parallel optical path design.
However, the conventional telecentric lens has a complex structure, high cost and large lens distortion.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the telecentric lens which is simple in structure, low in cost, small in lens distortion and suitable for industrial detection.
In order to achieve the purpose, the invention is implemented according to the following technical scheme:
a telecentric lens suitable for industrial detection comprises a conical lens barrel, a lens support ring arranged in an inner circular hole at the top end of the lens barrel, and a focusing ring sleeved outside the lens support ring, wherein a first spherical lens, a second spherical lens, a third spherical lens and a fourth planar lens are sequentially fixed in the lens support ring from top to bottom along an optical axis from an image object plane to an object plane; the object side of the fifth spherical lens is a concave surface, the image side is a concave surface, the object side of the sixth spherical lens is a convex surface, the image side is a convex surface, the object side of the seventh spherical lens is a convex surface, and the image side is a concave surface.
Furthermore, an inner circular hole is formed in the center of the lens support ring, a first snap ring, a second snap ring and a third snap ring are sequentially fixed in the inner circular hole of the lens support ring from top to bottom, the first snap ring is fixed at the top end of the inner circular hole of the lens support ring, a first spherical lens is fixed between the first snap ring and the second snap ring, a second spherical lens is fixed on the upper end surface of the third snap ring, a third spherical lens is fixed on the lower end surface of the third snap ring, and a fourth planar lens is fixed in the tail end of the inner circular hole of the lens support ring; a fourth snap ring and a fifth snap ring are sequentially fixed on the inner wall of the inner conical surface below the lens barrel from top to bottom, the fifth snap ring is fixed on the inner wall of the inner conical surface at the bottom of the lens barrel, the seventh spherical lens is fixed in the fifth snap ring, the fourth snap ring is positioned above the seventh spherical lens, and the sixth spherical lens and the seventh spherical lens are fixed on the upper end surface of the fourth snap ring; the outer wall of the lens cone is sleeved with a mounting ring.
Preferably, the radius of curvature of the convex surface on the object surface side of the first spherical lens is R196.32mm, the radius of curvature of the concave surface on the image surface side of the second spherical lens is R13mm, and the core thickness of the first spherical lens is 5 mm.
Preferably, the radius of curvature of the convex surface on the object plane side of the second spherical lens is r14.72mm, the radius of curvature of the convex surface on the image plane side of the second spherical lens is r196.32mm, and the core thickness of the second spherical lens is 6.41 mm.
Preferably, the radius of curvature of the concave surface on the object plane side of the third spherical lens is R96.32mm, and the radius of curvature of the concave surface on the image plane side of the third spherical lens is R13 mm.
Preferably, the diameter of the fourth plane mirror is 2.93mm, and the thickness of the fourth plane mirror is 1 mm.
Preferably, the radius of curvature of the concave surface on the object surface side of the fifth spherical lens is r251.02mm, the radius of curvature of the concave surface on the image surface side of the fifth spherical lens is r251.02mm, and the core thickness of the fifth spherical lens is 8 mm.
Preferably, the radius of curvature of the convex surface on the object surface side of the seventh spherical lens is r251.02mm, the radius of curvature of the convex surface on the image surface side of the sixth spherical lens is r251.02mm, and the core thickness of the sixth spherical lens is 18 mm.
Preferably, the fifth spherical lens and the sixth spherical lens are cemented lenses.
Preferably, the radius of curvature of the convex surface on the object surface side of the seventh spherical lens is R150mm, the radius of curvature of the concave surface on the image surface side of the seventh spherical lens is r713.49mm, and the core thickness of the seventh spherical lens is 13 mm.
Compared with the prior art, the telecentric lens suitable for industrial detection can realize an object space telecentric light path, overcomes the measurement error caused by the change of the object distance, has extremely low aberration and higher imaging precision, is suitable for industrial detection, and has simple structure and low cost.
Drawings
Fig. 1 is a cross-sectional view of a lens support ring of a telecentric lens suitable for industrial inspection according to the present invention.
Fig. 2 is a cross-sectional view of a telecentric lens suitable for industrial inspection according to the present invention.
Fig. 3 is a schematic view of the lens of the telecentric lens suitable for industrial inspection according to the present invention.
Fig. 4 is a structural diagram of a telecentric lens suitable for industrial inspection according to the present invention.
Fig. 5 is a curvature of field diagram of a telecentric lens suitable for industrial inspection according to the present invention.
Fig. 6 is a transfer function diagram of a telecentric lens suitable for industrial inspection according to the present invention.
Fig. 7 is a view field diagram of the transfer function vs. field of the telecentric lens suitable for industrial inspection according to the present invention.
Fig. 8 is a stippling diagram of a telecentric lens suitable for industrial inspection according to the present invention.
FIG. 9 is a perspective view of the outer surface of a bearing shot by the telecentric lens suitable for industrial inspection according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. The specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in fig. 1-3, the telecentric lens suitable for industrial inspection according to the embodiment includes a tapered lens barrel 6, a lens support ring 5 installed in an inner circular hole at the top end of the lens barrel 6, and a focusing ring 3 sleeved outside the lens support ring 5, wherein a first spherical lens 10, a second spherical lens 11, a third spherical lens 12, and a fourth planar lens 13 are sequentially fixed in the lens support ring 5 from top to bottom along an optical axis from an object plane to an object plane, a fifth spherical lens 14, a sixth spherical lens 15, and a seventh spherical lens 16 are sequentially fixed in the lens barrel 6 from top to bottom along the optical axis from the object plane to the object plane, the object plane side of the first spherical lens 10 is a convex surface, the image plane side is a concave surface, the object plane side of the second spherical lens 11 is a convex surface, the image plane side is a convex surface, the object plane side of the third spherical lens 12 is a concave surface, and the image plane side is a concave surface; the fifth spherical lens 14 has a concave object surface side and a concave image surface side, the sixth spherical lens 15 has a convex object surface side and a convex image surface side, and the seventh spherical lens 16 has a convex object surface side and a concave image surface side.
In this embodiment, an inner circular hole is formed in the center of the lens support ring 5, a first snap ring 1, a second snap ring 2 and a third snap ring 4 are sequentially fixed in the inner circular hole of the lens support ring 5 from top to bottom, the first snap ring 1 is fixed at the top end of the inner circular hole of the lens support ring 5, a first spherical lens 10 is fixed between the first snap ring 1 and the second snap ring 2, a second spherical lens 11 is fixed at the upper end surface of the third snap ring 4, a third spherical lens 12 is fixed at the lower end surface of the third snap ring 4, and a fourth flat lens 13 is fixed in the tail end of the inner circular hole of the lens support ring 5; a fourth snap ring 8 and a fifth snap ring 9 are sequentially fixed on the inner wall of the inner conical surface below the lens barrel 6 from top to bottom, the fifth snap ring 9 is fixed on the inner wall of the inner conical surface at the bottom of the lens barrel 6, a seventh spherical lens 16 is fixed in the fifth snap ring 9, the fourth snap ring 8 is positioned above the seventh spherical lens 16, and a sixth spherical lens 15 and the seventh spherical lens 16 are fixed on the upper end surface of the fourth snap ring 8; the outer wall of the lens cone 6 is sleeved with a mounting ring 7.
In the present embodiment, the radius of curvature of the convex surface on the object surface side of the first spherical lens 10 is R12.348mm, the radius of curvature of the concave surface on the image surface side of the second spherical lens 14 is R13mm, and the core thickness of the first spherical lens 10 is 5 mm.
In this embodiment, the radius of curvature of the convex surface on the object plane side of the second spherical lens 11 is r14.72mm, the radius of curvature of the convex surface on the image plane side of the second spherical lens 11 is r196.32mm, and the core thickness of the second spherical lens 11 is 6.41 mm.
In this embodiment, the radius of curvature of the concave surface on the object plane side of the third spherical lens 12 is R96.32mm, and the radius of curvature of the concave surface on the image plane side of the third spherical lens 12 is R13 mm.
In this embodiment, the diameter of the fourth plane mirror 13 is 2.93mm, and the thickness of the fourth plane mirror 13 is 1 mm.
In this embodiment, the radius of curvature of the concave surface on the object plane side of the fifth spherical lens 14 is r251.02mm, the radius of curvature of the concave surface on the image plane side of the fifth spherical lens 14 is r225.435mm, and the core thickness of the fifth spherical lens 14 is 8 mm.
In this embodiment, the radius of curvature of the convex surface on the object surface side of the seventh spherical lens 19 is r251.02mm, the radius of curvature of the convex surface on the image surface side of the sixth spherical lens 15 is r251.02mm, and the core thickness of the sixth spherical lens 15 is 18 mm.
In this embodiment, the fifth spherical lens 14 and the sixth spherical lens 15 are cemented lenses.
In this embodiment, the radius of curvature of the convex surface on the object surface side of the seventh spherical lens 16 is R150mm, the radius of curvature of the concave surface on the image surface side of the seventh spherical lens 16 is R1713.488mm, and the core thickness of the seventh spherical lens 16 is 13 mm.
Specifically, specific parameters of each lens in the present embodiment are shown in table 1.
TABLE 1
| Surf | Radius | Thickness | nd | vd |
| OBJ | Infinite number of elements | 181.900 | ||
| 1 | 150.000 | 13.000 | 1.755002 | 52.329298 |
| 2 | 17 | 2.000 | ||
| 3 | 251.020 | 18.000 | 0.552479 | 63.372062 |
| 4 | 21.0200 | 8.000 | 1.3001 | 40.867939 |
| 5 | 25.435 | 16.424 | ||
| STO | Infinite number of elements | 8.692 | ||
| 7 | -96.3200 | 3.000 | 1.8008 | 22.690566 |
| 8 | 13.000 | 0.531 | ||
| 9 | 16.502 | 6.500 | 1.83001 | 40.867939 |
| 10 | -96.320 | 2.000 | ||
| 11 | 12.348 | 5.000 | 1.75002 | 52.329298 |
| 12 | 13.000 | 11.000 | ||
| IMA | Infinite number of elements | - |
In order to verify the optical performance of the outer panoramic lens applicable to industrial inspection according to the present embodiment, the outer panoramic lens applicable to industrial inspection according to the present embodiment is tested, and the test results are shown in fig. 4 to 8, where fig. 4 to 8 are a structure diagram, a field curvature diagram, a transfer function vs.
As can be seen from FIG. 4, the total axial length of the lens is 428.04720mm, the total axial length of the lens is moderate, and the lens is suitable for processing and use.
As can be seen from FIG. 5, the curvature of field of the lens is less than 0.1mm, the coincidence ratio of the intersection point of the light beam and the ideal image point is good, the whole image is basically on one plane, and the quality of the image is excellent. The distortion of the lens is less than 0.05%, the image deformation rate is small, and the image can reflect the real situation of the sample more truly.
As can be seen from fig. 6, the optical transfer function of the lens is affected by the diffraction limit and the spatial frequency. The optical transfer function decreases with increasing diffraction limit and decreases with increasing spatial frequency. When the spatial frequency is 0mm-60mm and the diffraction limit is 0mm-3.3mm, the optical transfer function is always greater than 50%, and the optical information loss is less.
As can be seen from fig. 7, the spatial frequency significantly affects the optical transfer function, and the higher the spatial frequency, the lower the optical transfer function. The size of the field of view has little effect on the optical transfer function. When the spatial frequency is 0-60mm, the optical transfer function is more than 50%, and the lens has excellent optical transfer effect and less optical information loss.
As can be seen from fig. 8, the airy disc of the lens is 5.733 μm, the airy disc has a small radius value, the concentration of the light with the image plane after being imaged by the lens is high, the distribution of the points in the spot pattern is dense, and the resolution of the lens is high.
Referring to fig. 9, the telecentric lens suitable for industrial inspection according to the above embodiment can be used for inspecting industrial products, and when the telecentric lens is used, the lens support ring 5 is installed at the front end of the camera, so that the telecentric lens for industrial inspection can realize an object-side telecentric optical path, thereby overcoming the measurement error caused by the change of the object distance, reducing the lens distortion, ensuring the measurement accuracy, being suitable for industrial inspection, and having simple structure and low cost. Fig. 9 is an end view of a bearing captured by the outer telecentric lens. The image has high definition, bright field and dark field in the image are distinguished obviously, and the image presents the actual structure of the end face of the bearing in a ratio of 1:1, so that the processing of a later image algorithm is facilitated. The imaging of the lens is clear, and the imaging of the whole surface can be realized at one time.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a telecentric lens suitable for industry detects, is including being conical lens cone (6), installing lens support ring (5) in the round hole in lens cone (6) top, suit focusing circle (3) outside lens support ring (5), its characterized in that: a first spherical lens (10), a second spherical lens (11), a third spherical lens (12) and a fourth planar lens (13) are sequentially fixed in the lens support ring (5) from top to bottom along an optical axis from an image object plane to an object plane, a fifth spherical lens (14), a sixth spherical lens (15) and a seventh spherical lens (16) are sequentially fixed in the lens barrel (6) from top to bottom along the optical axis from the image object plane to the object plane, the object plane side of the first spherical lens (10) is a convex surface, the image plane side is a concave surface, the object plane side of the second spherical lens (11) is a convex surface, the image plane side is a convex surface, the object plane side of the third spherical lens (12) is a concave surface, and the image plane side is a concave surface; the object surface side of the fifth spherical lens (14) is a concave surface, the image surface side is a concave surface, the object surface side of the sixth spherical lens (15) is a convex surface, the image surface side is a convex surface, the object surface side of the seventh spherical lens (16) is a convex surface, and the image surface side is a concave surface.
2. A telecentric lens suitable for industrial inspection according to claim 1, characterized in that: an inner circular hole is formed in the center of the lens support ring (5), a first clamping ring (1), a second clamping ring (2) and a third clamping ring (4) are sequentially fixed in the inner circular hole of the lens support ring (5) from top to bottom, the first clamping ring (1) is fixed at the top end of the inner circular hole of the lens support ring (5), a first spherical lens (10) is fixed between the first clamping ring (1) and the second clamping ring (2), a second spherical lens (11) is fixed on the upper end face of the third clamping ring (4), a third spherical lens (12) is fixed on the lower end face of the third clamping ring (4), and a fourth planar lens (13) is fixed in the tail end of the inner circular hole of the lens support ring (5); a fourth snap ring (8) and a fifth snap ring (9) are sequentially fixed on the inner wall of the inner conical surface below the lens cone (6) from top to bottom, the fifth snap ring (9) is fixed on the inner wall of the inner conical surface at the bottom of the lens cone (6), a seventh spherical lens (16) is fixed in the fifth snap ring (9), the fourth snap ring (8) is positioned above the seventh spherical lens (16), and a sixth spherical lens (15) and the seventh spherical lens (16) are fixed on the upper end surface of the fourth snap ring (8); the outer wall of the lens cone (6) is sleeved with a mounting ring (7).
3. A telecentric lens suitable for industrial inspection according to claim 1 or 2, characterized in that: the curvature radius of the convex surface of the first spherical lens (10) on the object surface side is R196.32mm, the curvature radius of the concave surface of the second spherical lens (14) on the image surface side is R13mm, and the core thickness of the first spherical lens (10) is 5 mm.
4. A telecentric lens suitable for industrial inspection according to claim 1 or 2, characterized in that: the radius of curvature of the convex surface of the second spherical lens (11) on the object plane side is R14.72mm, the radius of curvature of the convex surface of the second spherical lens (11) on the image plane side is R196.32mm, and the core thickness of the second spherical lens (11) is 6.41 mm.
5. A telecentric lens suitable for industrial inspection according to claim 1 or 2, characterized in that: the radius of curvature of the concave surface on the object plane side of the third spherical lens (12) is R96.32mm, and the radius of curvature of the concave surface on the image plane side of the third spherical lens (12) is R13 mm.
6. A telecentric lens suitable for industrial inspection according to claim 1 or 2, characterized in that: the diameter of the fourth plane lens (13) is 2.93mm, and the thickness of the fourth plane lens (13) is 1 mm.
7. A telecentric lens suitable for industrial inspection according to claim 1 or 2, characterized in that: the radius of curvature of the concave surface of the fifth spherical lens (14) on the object surface side is R251.02mm, the radius of curvature of the concave surface of the fifth spherical lens (14) on the image surface side is R251.02mm, and the core thickness of the fifth spherical lens (14) is 8 mm.
8. A telecentric lens suitable for industrial inspection according to claim 1 or 2, characterized in that: the curvature radius of the convex surface of the seventh spherical lens (19) on the object surface side is R251.02mm, the curvature radius of the convex surface of the sixth spherical lens (15) on the image surface side is R251.02mm, and the core thickness of the sixth spherical lens (15) is 18 mm.
9. A telecentric lens suitable for industrial inspection according to claim 1 or 2, characterized in that: the fifth spherical lens (14) and the sixth spherical lens (15) are cemented lenses.
10. A telecentric lens suitable for industrial inspection according to claim 1 or 2, characterized in that: the radius of curvature of the convex surface of the seventh spherical lens (16) on the object surface side is R150mm, the radius of curvature of the concave surface of the seventh spherical lens (16) on the image surface side is R713.49mm, and the core thickness of the seventh spherical lens (16) is 13 mm.
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| CN202010936820.7A CN112034604A (en) | 2020-09-08 | 2020-09-08 | Telecentric lens suitable for industrial detection |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1576933A (en) * | 2003-07-17 | 2005-02-09 | 株式会社理光 | Image reading apparatus and imaging apparatus using the same reading device |
| US20050264867A1 (en) * | 2004-05-27 | 2005-12-01 | Cho Gyoung I | Beam focusing and scanning system using micromirror array lens |
| CN106443975A (en) * | 2016-12-16 | 2017-02-22 | 福建福光天瞳光学有限公司 | Optical industrial lens with high resolution and low distortion |
| CN109725409A (en) * | 2019-01-29 | 2019-05-07 | 广东奥普特科技股份有限公司 | A kind of telecentric lens |
-
2020
- 2020-09-08 CN CN202010936820.7A patent/CN112034604A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1576933A (en) * | 2003-07-17 | 2005-02-09 | 株式会社理光 | Image reading apparatus and imaging apparatus using the same reading device |
| US20050264867A1 (en) * | 2004-05-27 | 2005-12-01 | Cho Gyoung I | Beam focusing and scanning system using micromirror array lens |
| CN106443975A (en) * | 2016-12-16 | 2017-02-22 | 福建福光天瞳光学有限公司 | Optical industrial lens with high resolution and low distortion |
| CN109725409A (en) * | 2019-01-29 | 2019-05-07 | 广东奥普特科技股份有限公司 | A kind of telecentric lens |
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